WMN Architecture

We can differentiate between three basic types of WMN architectures: infrastructure mesh, client mesh, and hybrid mesh [9]. Figure 16.2 is an example of an infrastructure WMN. The mesh routers collectively provide a wireless backbone infrastructure. In this architecture, clients have a passive role and do not contribute to the mesh infrastructure. In a client mesh architecture (Figure 16.3), the network is made up of user devices only and no dedicated network infrastructure is involved. Since client devices themselves constitute the network, they need to

Wired link Wireless link

Server

Wired link Wireless link

Server

Wired Link

Figure 16.1 Traditional WLAN.

perform functions such as routing and self-configuration themselves. Clients relay packets on behalf of peers and essentially implement the role of mesh routers, in addition to running the user applications. This places a significantly higher demand on the end-user terminals, both in terms of functionality and resource consumption, e.g., computation and power. A client mesh is essentially identical to a traditional ad hoc network [10].

A hybrid mesh architecture combines the concepts of infrastructure and client mesh networks (Figure 16.4). A hybrid WMN consists of mesh routers that form the backbone of the network. In addition, mobile clients can actively participate in the creation of the mesh by providing network functionalities, such as routing and forwarding of data packets. Clients implementing these functionalities can therefore act as a dynamic extension to the more static infrastructure part of the mesh. The hybrid mesh is very flexible and allows combining the benefits of both infrastructure and client mesh architectures.

Wired link Wireless link

Internet gateway

Internet a

0 0

Post a comment